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IGCSE Physics - Year 11 > IGCSE Physics formulae > Flashcards

IGCSE Physics formulae Flashcards

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1
Q

speed

A

distance travelled

time taken

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2
Q

s =

A

d

t

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3
Q

acceleration

A

change in velocity

time taken

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4
Q

a =

A

(v-u)

t

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5
Q

Hooke’s law for springs

A

Force applied to a spring is proportional to its extension, up to the limit of proportionality

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6
Q

For a spring,

F =

A

kx

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7
Q

Resultant force on an object

A

mass x acceleration

or

the vector sum of all the individual forces acting on it

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8
Q

For an accelerating object with a resultant force on it,

F =

A

ma

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9
Q

weight

A

mass x gravitational field strength

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10
Q

W =

A

mg

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11
Q

What is the gravitational field strength at the surface of the Earth (with units)

A

10 N/kg

(approximately)

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12
Q

density

A

mass

volume

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13
Q

**ρ = **

A

m

V

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14
Q

moment

A

force x perpendicular distance to the line of action of the force

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15
Q

moment of a force =

A

Fd

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16
Q

The Principle of Moments

A

If a body is in equilibrium,

sum of clockwise moments = sum of anticlockise moments

F1d1 + F2d2….= F3d3 + F4d4…

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17
Q

current (in amps)

A

charge (in coulombs)

time (in seconds)

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18
Q

Q =

A

It

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19
Q

I =

A

Q

t

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20
Q

Refractive index of a material

A

speed of light in a vacuum

speed of light in the material

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21
Q

n =

A

sin i

sin r

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22
Q

Electromagnetic spectrum in order of decreasing wavelength

A
23
Q

frequency (in Hz)

A

number of waves passing per second

24
Q

f =

A

1

T

(T= the period of the, i.e. the time for one complete wave)

25
Q

wave speed (in m/s)

A

frequency (in Hz) x wavelength (in m)

26
Q

For a wave

v =

A

fλ

27
Q

The prefix M in front of a unit means?

A

“mega” / million

e.g. 1Mz = 1,000,000 Hz

28
Q

EGPE =

A

mgΔh

29
Q

**EKE = **

A

mv2

2

30
Q

Efficiency

A

useful energy ( x 100%)

total energy supplied

31
Q

Work done against a force

A

force x distance moved against the force

32
Q

W =

A

Fd

33
Q

Power

A

energy transferred

time taken

34
Q

P

A

E

t

35
Q

E =

(in terms of power)

A

Pt

36
Q

Pressure

A

force

area the force is applied over

37
Q

p =

A

F

A

38
Q

The SI units of pressure are?

A

pascal or newtons per square metre

Pa N/m2

39
Q

p =

(due a liquid of depth of h)

A

hρg

40
Q

Boyle’s Law for a fixed mass of gas at a constant temperature in locations 1 and 2

A

p1V1 = p2V2

41
Q

Energy required to change state

E =

A

mL

42
Q

Energy required to raise the temeprature of an object

E =

A

mc(θ1-θ2)

or

mcΔT

43
Q

Units of specific heat capacity

A

J/(kg **°C)**

44
Q

Electrical energy transferred

E =

A

QV

45
Q

Resistance of a component in an electric circuit

A

Potential Difference across the component

current through the component

46
Q

V =

A

IR

47
Q

Electrical power

P =

A

IV

48
Q

Energy transferred by an electric current

E =

A

ItV

49
Q

The transformer equation

A

Vp = Np

Vs Ns

50
Q

Assuming a transformer is 100% efficient, the power on either side is linked by the equation

A

VpIp = VsIs

51
Q

For resistors in series,

Rtotal =

A

R1 + R2 + …

52
Q

For resistors in parallel,

**1 = **

Rtotal

A

1 + 1 + …

R1 R2 .

53
Q

The total Potential Difference across components in series the same branch of an electric circuit

A

= V1 + V2 + …

54
Q

The sum of the currents flowing into a junction in an electric circuit

A

= the sum of all the currents flowing out of the junction

IGCSE Physics - Year 11 (1 decks)

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